JS代码的格式化和压缩_JavaScript

来源：汇意旅游网

曾经为看别人写的杂乱代码而头痛吗?曾经为看BWindow代码而烦恼吗?曾经为减小JS体积和JS的可读性之间的矛盾而左右徘徊吗?最好的办法是有个代码格式化和代码压缩的程序,今天总算有了,它是纯JS编写的,当然也就是开源的了.由于写的仓促,还有些小BUG,请经常注意更新!

<HTML><HEAD><TITLE>Format</TITLE> <META content="MSHTML 6.00.2800.1528" name=GENERATOR> <META content="" name=Author> <META content="" name=Keywords> <META content="" name=Description></HEAD> <BODY> <SCRIPT language=JavaScript> document.getElementById("display").innerHTML = xx.format(); --------------------------------------------------------------------------------------------------- ** 作者：ttyp ** 邮件：ttyp@21cn.com ** 日期：2006-5-21 ** 版本：0.1 ** ================================================================================================== **/ function CLASS_FORMAT(code){ //哈希表类 function Hashtable(){ this._hash = new Object(); this.add = function(key,value){ if(typeof(key)!="undefined"){ if(this.contains(key)==false){ this._hash[key]=typeof(value)=="undefined"?null:value; return true; } else { return false; } } else { return false; } } this.remove = function(key){delete this._hash[key];} this.count = function(){var i=0;for(var k in this._hash){i++;} return i;} this.items = function(key){return this._hash[key];} this.contains = function(key){return typeof(this._hash[key])!="undefined";} this.clear = function(){for(var k in this._hash){delete this._hash[k];}} } this._caseSensitive = true; //字符串转换为哈希表 this.str2hashtable = function(key,cs){ var _key = key.split(/,/g); var _hash = new Hashtable(); var _cs = true; if(typeof(cs)=="undefined"||cs==null){ _cs = this._caseSensitive; } else { _cs = cs; } for(var i in _key){ if(_cs){ _hash.add(_key[i]); } else { _hash.add((_key[i]+"").toLowerCase()); } } return _hash; } //获得需要转换的代码 this._codetxt = code; if(typeof(syntax)=="undefined"){ syntax = ""; } this._deleteComment = false; //是否大小写敏感 this._caseSensitive = true; //可以后面加块语句的关键字 this._blockElement = this.str2hashtable("switch,if,while,try,finally"); //是函数申明 this._function = this.str2hashtable("function"); //本行括号内分号不做换行 this._isFor = "for"; this._choiceElement = this.str2hashtable("else,catch"); this._beginBlock = "{"; this._endBlock = "}"; this._singleEyeElement = this.str2hashtable("var,new,return,else,delete,in,case"); //得到分割字符 this._wordDelimiters= "　 ,.?!;:\\/<>(){}[]\"'\r\n\t=+-|*%@#$^&"; //引用字符 this._quotation = this.str2hashtable("\",'"); //行注释字符 this._lineComment = "//"; //转义字符 this._escape = "\\"; //多行引用开始 this._commentOn = "/*"; //多行引用结束 this._commentOff = "*/"; //行结束词 this._rowEnd = ";"; this._in = "in"; this.isCompress = false; this.style = 0; this._tabNum = 0; this.format = function() { var codeArr = new Array(); var word_index = 0; var htmlTxt = new Array(); if(this.isCompress){ this._deleteComment = true; } //得到分割字符数组(分词) for (var i = 0; i < this._codetxt.length; i++) { if (this._wordDelimiters.indexOf(this._codetxt.charAt(i)) == -1) { //找不到关键字 if (codeArr[word_index] == null || typeof(codeArr[word_index]) == 'undefined') { codeArr[word_index] = ""; } codeArr[word_index] += this._codetxt.charAt(i); } else { if (typeof(codeArr[word_index]) != 'undefined' && codeArr[word_index].length > 0) word_index++; codeArr[word_index++] = this._codetxt.charAt(i); } } var quote_opened = false; //引用标记 var slash_star_comment_opened = false; //多行注释标记 var slash_slash_comment_opened = false; //单行注释标记 var line_num = 1; //行号 var quote_char = ""; //引用标记类型 var function_opened = false; var bracket_open = false; var for_open = false; //按分割字，分块显示 for (var i=0; i <=word_index; i++){ //处理空行（由于转义带来） if(typeof(codeArr[i])=="undefined"||codeArr[i].length==0){ continue; } else if(codeArr[i]==" "||codeArr[i]=="\t"){ if(slash_slash_comment_opened||slash_star_comment_opened){ if(!this._deleteComment){ htmlTxt[htmlTxt.length] = codeArr[i]; } } if(quote_opened){ htmlTxt[htmlTxt.length] = codeArr[i]; } } else if(codeArr[i]=="\n"){ //处理换行 } else if (codeArr[i] == "\r"){ slash_slash_comment_opened = false; quote_opened = false; line_num++; if(!this.isCompress){ htmlTxt[htmlTxt.length] = "\r\n"+ this.getIdent(); } //处理function里的参数标记 } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&this.isFunction(codeArr[i])){ htmlTxt[htmlTxt.length] = codeArr[i] + " "; function_opened = true; } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==this._isFor){ htmlTxt[htmlTxt.length] = codeArr[i]; for_open = true; } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]=="("){ bracket_open = true; htmlTxt[htmlTxt.length] = codeArr[i]; } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==")"){ bracket_open = false; htmlTxt[htmlTxt.length] = codeArr[i]; } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==this._rowEnd){ if(!this.isCompress){ if(!for_open){ if(i<word_index&&(codeArr[i+1]!="\r"&&codeArr[i+1]!="\n")){ htmlTxt[htmlTxt.length] = codeArr[i] + "\n" + this.getIdent(); }else{ htmlTxt[htmlTxt.length] = codeArr[i] + this.getIdent(); } }else{ htmlTxt[htmlTxt.length] = codeArr[i]; } }else{ htmlTxt[htmlTxt.length] = codeArr[i]; } } else if(!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==this._beginBlock){ for_open = false; if(!this.isCompress){ switch(this.style){ case 0: this._tabNum++; htmlTxt[htmlTxt.length] = codeArr[i] + "\n" + this.getIdent(); break; case 1: htmlTxt[htmlTxt.length] = "\n" + this.getIdent(); this._tabNum++; htmlTxt[htmlTxt.length] = codeArr[i] + "\n"+ this.getIdent(); break; default: this._tabNum++; htmlTxt[htmlTxt.length] = codeArr[i]; break; } }else{ htmlTxt[htmlTxt.length] = codeArr[i]; } } else if(!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==this._endBlock){ if(!this.isCompress){ this._tabNum--; if(i<word_index&&codeArr[i+1]!=this._rowEnd){ htmlTxt[htmlTxt.length] = "\n" + this.getIdent() + codeArr[i]; }else{ htmlTxt[htmlTxt.length] = "\n" + this.getIdent() + codeArr[i]; } }else{ if(i<word_index&&codeArr[i+1]!=this._rowEnd){ htmlTxt[htmlTxt.length] = codeArr[i] + this._rowEnd; }else{ htmlTxt[htmlTxt.length] = codeArr[i]; } } //处理关键字 } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened && this.isBlockElement(codeArr[i])){ htmlTxt[htmlTxt.length] = codeArr[i]; //处理内置对象(后面加一个空格) } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened && this.isSingleEyeElement(codeArr[i])){ if(codeArr[i]==this._in){ htmlTxt[htmlTxt.length] = " "; } htmlTxt[htmlTxt.length] = codeArr[i] + " "; //处理双引号（引号前不能为转义字符） } else if (!slash_star_comment_opened&&!slash_slash_comment_opened&&this._quotation.contains(codeArr[i])){ if (quote_opened){ //是相应的引号 if(quote_char==codeArr[i]){ htmlTxt[htmlTxt.length] = codeArr[i]; quote_opened = false; quote_char = ""; } else { htmlTxt[htmlTxt.length] = codeArr[i]; } } else { htmlTxt[htmlTxt.length] = codeArr[i]; quote_opened = true; quote_char = codeArr[i]; } //处理转义字符 } else if(codeArr[i] == this._escape){ htmlTxt[htmlTxt.length] = codeArr[i]; if(i<word_index-1){ if(codeArr[i+1].charCodeAt(0)>=32&&codeArr[i+1].charCodeAt(0)<=127){ htmlTxt[htmlTxt.length] = codeArr[i+1].substr(0,1); htmlTxt[htmlTxt.length] = codeArr[i+1].substr(1); i=i+1; } } //处理多行注释的开始 } else if (!slash_slash_comment_opened && !slash_star_comment_opened&&!quote_opened&&this.isStartWith(this._commentOn,codeArr,i)){ slash_star_comment_opened = true; if(!this._deleteComment){ htmlTxt[htmlTxt.length] = this._commentOn; } i = i + this.getSkipLength(this._commentOn); //处理单行注释 } else if (!slash_slash_comment_opened && !slash_star_comment_opened&&!quote_opened&&this.isStartWith(this._lineComment,codeArr,i)){ slash_slash_comment_opened = true; if(!this._deleteComment){ htmlTxt[htmlTxt.length] = this._lineComment; } i = i + this.getSkipLength(this._lineComment); //处理忽略词 } else if (!slash_slash_comment_opened && !slash_star_comment_opened&&!quote_opened&&this.isStartWith(this._ignore,codeArr,i)){ slash_slash_comment_opened = true; htmlTxt[htmlTxt.length] = this._ignore; i = i + this.getSkipLength(this._ignore); //处理多行注释结束 } else if (!quote_opened&&!slash_slash_comment_opened&&this.isStartWith(this._commentOff,codeArr,i)){ if (slash_star_comment_opened) { slash_star_comment_opened = false; if(!this._deleteComment){ htmlTxt[htmlTxt.length] = this._commentOff; } i = i + this.getSkipLength(this._commentOff); } } else { //不是在字符串中 if(!quote_opened){ //如果不是在注释重 if(!slash_slash_comment_opened && !slash_star_comment_opened){ htmlTxt[htmlTxt.length] = codeArr[i]; //注释中 }else{ if(!this._deleteComment){ htmlTxt[htmlTxt.length] = codeArr[i]; } } }else{ htmlTxt[htmlTxt.length] = codeArr[i]; } } } return htmlTxt.join(""); } this.isStartWith = function(str,code,index){ if(typeof(str)!="undefined"&&str.length>0){ var cc = new Array(); for(var i=index;i<index+str.length;i++){ cc[cc.length] = code[i]; } var c = cc.join(""); if(this._caseSensitive){ if(str.length>=code[index].length&&c.indexOf(str)==0){ return true; } }else{ if(str.length>=code[index].length&&c.toLowerCase().indexOf(str.toLowerCase())==0){ return true; } } return false; } else { return false; } } this.isFunction = function(val){ return this._function.contains(this._caseSensitive?val:val.toLowerCase()); } this.isBlockElement = function(val) { return this._blockElement.contains(this._caseSensitive?val:val.toLowerCase()); } this.isChoiceElement = function(val) { return this._choiceElement.contains(this._caseSensitive?val:val.toLowerCase()); } this.isSingleEyeElement = function(val) { return this._singleEyeElement.contains(this._caseSensitive?val:val.toLowerCase()); } this.isNextElement = function(from,word){ for(var i=from;i<word.length;i++){ if(word[i]!=" "&&word[i]!="\t"&&word[i]!="\r"&&word[i]!="\n"){ return this.isChoiceElement(word[i]); } } return false; } this.getSkipLength = function(val){ var count = 0; for(var i=0;i<val.length;i++){ if(this._wordDelimiters.indexOf(val.charAt(i))>=0){ count++; } } if(count>0){ count=count-1; } return count; } this.getIdent=function(){ var n = []; for(var i=0;i<this._tabNum;i++){ n[n.length] = "\t"; } return n.join(""); } } function doformat(o){ var htmltxt = ""; if (o == null){ alert("domNode is null!"); return; } var _codetxt = ""; if(typeof(o)=="object"){ switch(o.tagName){ case "TEXTAREA": case "INPUT": _codetxt = o.value; break; case "DIV": case "SPAN": _codetxt = o.innerText; break; default: _codetxt = o.innerHTML; break; } }else{ _codetxt = o; } var _syn = new CLASS_FORMAT(_codetxt); htmltxt = _syn.format(); return htmltxt; } function go() { var code = document.getElementById("code").value; var xx = new CLASS_FORMAT(code); var a = new Date(); if(document.getElementById('cboOperate').selectedIndex==1){ xx.isCompress=true; }else{ xx.style = parseInt(document.getElementById('cboStyle').value); } document.getElementById("display").value = xx.format(); alert("共花：" + (new Date().getTime()-a.getTime()) + "ms"); } //--> </SCRIPT> <TEXTAREA id=code rows=12 cols=100> /* 这个是一个类 */ function xx (num,str){//说明 var a = num;this.aa = a; this.bb = function(){alert(str);} this.cc = function(){for(var i=0;i<10;i++){document.title=i;}}}; xx.prototype.dd= function(){alert("d d kd");} var a = new xx(100,"hello"),b=new xx(0,"ttyp"); if(1>2) { alert(); } else { alert(" hell "); } a.bb(); b.dd(); alert(a.aa); </textarea> </BODY></HTML> 
[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]